﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Reflection;

namespace Tools.Win32
{
    class MouseHook
    {
        public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);
        //定义钩子句柄
        public static int hHook = 0;
        //定义钩子类型
        public const int WH_MOUSE_LL = 14;
        public HookProc MyProcedure;
        //安装钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        //卸载钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);
        //调用下一个钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);

        [StructLayout(LayoutKind.Sequential)]
        public class POINT
        {
            public int x;
            public int y;
        }
        [StructLayout(LayoutKind.Sequential)]
        public class MouseHookStruct
        {
            public POINT pt;
            public int hwnd;
            public int wHitTestCode;
            public int dwExtraInfo;
        }

        public int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
        {

            MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
            if (nCode < 0)
            {
                return CallNextHookEx(hHook, nCode, wParam, lParam);
            }
            else
            {
                //String strCaption = "x = " + MyMouseHookStruct.pt.x.ToString("d") + "  y = " + MyMouseHookStruct.pt.y.ToString("d");
                //this.Text = strCaption;
                return CallNextHookEx(hHook, nCode, wParam, lParam);
            }
        }

        public void StartHook(object sender, EventArgs e)
        {
            if (hHook == 0)
            {
                MyProcedure = new HookProc(this.MouseHookProc);
                //这里挂节钩子
                hHook = SetWindowsHookEx(WH_MOUSE_LL, MyProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
                if (hHook == 0)
                {
                    return;
                }
            }
        }

        public void ExitHook(object sender, EventArgs e)
        {
            bool ret = UnhookWindowsHookEx(hHook);
            if (ret == false)
            {
                return;
            }
            hHook = 0;
        }


    }
}
